disadvantage here is that the temperature is hard
to control and the organic material in the sample
may be burned; this would cause a slight to moder-
ate inaccuracy in the result. The thermostat on an
electric oven can be set to the desired temperature.
PROCEDURE.— Before beginning the tests,
weigh each of the moisture boxes and record the
weight by can number. Record this weight as tare
weight (weight that allows for a deduction of the
can). Then fill each can with a sample and weigh
the can (with lid on) and contents.
Remove the lid and place the can, contents,
and lid in the oven or pan to dry. In an electric
oven, maintain the temperature between 212°F
and 230°F (105°C ± 10°C); dry the sample for
at least 8 hr—even longer for clay or silt. Then
weigh the dry can, contents, and lid.
Record the results on a form like the one
shown in figure 15-27. In the example shown in
Figure 15-27.-Data sheet for moisture content tests.
15-19
